Study on Calibration Algorithm of Embedded Touch Screen

2014 ◽  
Vol 9 (4) ◽  
Author(s):  
Ping-yong Li ◽  
Zhong-wen Li
Keyword(s):  
Touch Screen ◽  
Calibration Algorithm

Improvements of Infrared Touch Screen Calibration Algorithm Based on Affine Transformation

2014 ◽  
Vol 716-717 ◽  
pp. 1341-1345
Author(s):  
Wen Ming Guo ◽  
Gang Wang
Keyword(s):  
Affine Transformation ◽  
Touch Screen ◽  
The Other ◽  
Pass Rate ◽  
Sample Point ◽  
Affine Transform ◽  
Calibration Algorithm ◽  
Windows 8

Because the affine transformation can realize the coordinate translation, rotation, scaling, it is applied to calibrate the touch screen. But,requirements for touch errors of Windows 8 is ±0.5mm,and the pass rate of sample point must reach 4%.Therefore, simply use the method of draw-point to collect the sample point has been unable to meet the requirement of accuracy. This paper tries to propose two improved calibration algorithm based on affine transform, one method use drawing lines instead of marking point, the other devides the screen into a plurality of areas to use multiple calibration. This two kind of methods can effectively improve the calibration precision.

Research on Multi-Point Calibration and Touch Pressure of Touch-Screen

2012 ◽  
Vol 198-199 ◽  
pp. 1290-1293 ◽  
Author(s):  
Xiu Hong Jiang ◽  
Fu Hai Duan ◽  
Rui Guo
Keyword(s):  
Touch Screen ◽  
Test Results ◽  
Pressure Threshold ◽  
Calibration Algorithm ◽  
Point Set ◽  
Two Measures ◽  
Target Environment ◽  
Low Sensitivity ◽  
Coordinate Conversion ◽  
Calibration Coefficients

In view of the inaccuracy and low sensitivity of resistive touch-screen in small point target environment, two measures were proposed. First, based on the existing three-point calibration algorithm, more points were sampled to improve coordinate conversion precision, greedy algorithmm reduced the random calibration point set, and least squares algorithm fit the final calibration coefficients. Another measure was to utilize the touch pressure measurement and pressure threshold decision to remove invalid click. Finally, test results show that multi-point calibration with greedy algorithm can improve the precision of coordinate calibration, and the adoption of pressure decision can effectively enhance the system’s adaptability to touch intensity.

Design of Resistance Touch Screen Based on S3C6410 Embedded System

2014 ◽  
Vol 556-562 ◽  
pp. 1491-1494 ◽  
Author(s):  
Ying Wang ◽  
Ri Bo Ge ◽  
Mei Hua Li
Keyword(s):  
Embedded System ◽  
Touch Screen ◽  
Sampled Data ◽  
Algorithm Optimization ◽  
Filtration Method ◽  
Point Mapping ◽  
Practical Applications ◽  
Calibration Algorithm ◽  
Point To Point ◽  
Selection Of

This design uses Samsung ARM11 S3C6410 microprocessor and 4 wires resistive touch screen as the hardware foundation. Based on the hardware structure, the touch screen application is developed. System performance has been improved by means of the algorithm optimization of the sampled data and software filtration method, and lead to a strong practicability. In the end, three-point calibration algorithm is introduced for the offset problem of the screen coordinates, then the calibration matrix is decided by the selection of three-point, and then using software implementation to realize the calibration of point-to-point mapping relation, and finally make it more accurate in practical applications.

How Does Motion Influence the Use of Touch Screen In-Vehicle Information Systems?

2011 ◽  
Author(s):  
Michael G. Lenne ◽  
Paul M. Salmon ◽  
Tom J. Triggs ◽  
Miranda Cornelissen ◽  
Nebojsa Tomasevic
Keyword(s):  
Information Systems ◽  
Touch Screen ◽  
Vehicle Information

Sensory preconditioning of spatial learning using a touch-screen task with pigeons

2004 ◽  
Author(s):  
Kosuke Sawa ◽  
Kenneth J. Leising ◽  
Cory Fischer ◽  
Aaron P. Blaisdell
Keyword(s):  
Spatial Learning ◽  
Touch Screen ◽  
Sensory Preconditioning

Design and Application of Smart and Electrical Wheelchair and Charging Station for the Disabled Citizen

2020 ◽  
Vol 3 (1) ◽  
pp. 346-353
Author(s):  
Naim Suleyman Tinğ ◽  
Huseyin Ozel ◽  
Lokman Celik ◽  
Enes Ganidagli ◽  
Hilal Akkamis
Keyword(s):  
Smart Home ◽  
Touch Screen ◽  
Direct Access ◽  
Charging Station ◽  
The Disabled ◽  
Solar Powered ◽  
Home Technology ◽  
Smart Home Technology ◽  
Smart Wheelchair ◽  
Design And Application

In this paper, the design and application of smart wheelchair and charging station for disabled citizen is realized. The first stage of the paper is to make the wheelchair used by our disabled citizens able to access smart home technology via the vehicle via touch screen. The ability of citizens with disabilities to call with direct access via touch screen is also in the wheelchair designed. Thanks to the touch screen placed on the vehicle, disabled citizens are provided with the control of smart automation to control many objects such as curtains and doors in the home. In the second part of the paper, a solar powered charging station is designed and installed in order to charge battery powered wheelchairs. In the charging station made a special card reader system and has the charger to charge the card with disabilities to actively and means are provided.

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